Electric vehicles are quiet and have no emissions. - d. But their productions aren't quiet and have emissions. (This creates a contrasting statement about the overall production process vs. the vehicle itself)
Do you like electric car? - c. No, I don't. (Direct question and negative answer)
All the lights went out and we were left in the dark. - b. It was a really scary moment! (Statement of an event and a reaction to it)
Arab Saudi is really a rich country. - i. Because they export crude oil. (Statement of a fact and the reason for it)
Where does he work? - a. He works at a power plant. (Direct question and an answer about a place of work)
Why do they install the solar panel on the roof? - f. Solar panels can only operate in sunlight, and the roof is a good place. (Direct question and an explanation)
What is biomass? - e. The weight of living organisms is called biomass. (Direct question and a definition)
He sometimes drives around the town and does nothing. - j. It's a waste of time and energy. (Statement of an action and a negative opinion about it)
In the next century, nuclear energy could overtake oil as the main fuel. - h. I don't think so. Nuclear energy is dangerous, so not many countries will develop it. (Statement of a prediction and a contrasting opinion with a reason)
How do you know that is natural gas? - g. Natural gas burns with a bright blue flame. (Direct question about identification and a characteristic feature as an answer)